In order to test if putative nucleotide sequences in the RNA World and in both extended RNA codes, share the same scaling and statistical properties to those encountered in current prokaryotes, we used the genomes of four Eubacteria and three Archaeas.

Consequently, we have created a MySQL database, dndDB, to efficiently organize all available data from experimental and bioinformatics analyses about the phosphorothioation of DNA in Eubacteria and Archaea and provide a central repository of associated documentation.